Woodwork-polishing method



Patented Aug. 18, 1925.

UNITED STATES 1,550,456 PATENT OFFICE.

GEORG- RENGER, OF BERLIN-TEMPELHOF, AND JACQUES PERL, F BERLIN-CHARLOT- TENBURG, GERMANY, ASSIG-NO'RS TO -DR. J. PERL & CO. KOMMANDIT-GESELL- SCHAFT, OF BERLIN-TEMPELHOF, GERMANY.

WOODWORK-POLISHING METHOD.

No Drawing.

T 0 all whom it may concern Be it known that we, GEORG RENGER and 'JAo UEs PERL, citizens of the German Reublic, residing at Berlin-Tempelhof and erlin-Charlottenburg, respectively, Germany, have invented new and useful Improvements in Woodwork-Polishing Methods, of which the following is a specification. Our invention relates to improvements in woodwork polishing methods.

Many attempts have been made to replace the 'French method of polishing woodwork by means of shellac preparations, which method undoubtedly produces an excellent gloss which. is fairly durable, provided the articles so polished are carefully handled. Shellac polishes are, however, extremely sensitive to mechanical injuries and water, oil and even moist air, so that furniture and other Woodwork polished in this manner is notsuitable for damp climates or on board of ships, as the polish is then liable to develop white spots or smudges. A further drawback of the French polish is that it requires a long time, sometimes weeks, to obtain a good polish, such as is necessary for pianos, for instance. In spite of all this trouble and loss of time it frequently happens that such a polish shows a sweating of the pores in the wood.

The American method which is based on the employment of oil varnishes has not found general application, because it cannot compete at all with the shellac polish as regards 'loss, smoothness and fineness of structure. it has also been proposed to em 'ploy celluloid solutions by themselves or mixed with shellac solutions and linseed oil and to apply these polishes by means of pads in the manner usual to shellac polishes. Celluloid solutions have also already been used as ground or first coat as Wax-like substances, like mastic mixed with celluloid have been used for filling up the pores in the wood. All these methods are, however, only very poor substitutes for the otherwise very useful shellac polish.

The object of our invention is to produce a polish which has at least 'as good an appearance as the shellac polish, but has considerable advantages compared with it. The new polish can be finished in far shorter time and the dreaded sweating of the pores is entirely done away with. The polish is furwith Application filed January 23, 1925. Serial No. 4,268.

thermore far more impervious to mechanical 1n ur1es and water and may even be Washed soap.

Our invention consists in the employment of a celluloid-rosin polish which is applied in a special and particular manner. We are aware that celluloid-rosin compounds perse are also known for use as polishes or varnishes. lVhile these penetrate into the pores of the woodwork to be polished and for the finishing of the polish requires a coating of shellac this is no longer necessary in the particular application of the celluloid-rosin polish according to this invention and in v spite of this the desired glassy gloss and a restful surface is obtained. The new method enables therefore the production of excellent polishes while a great saving intime and shellac is effected.

Our improved method consists in applying a plurality of coats to the article to be polished in such a manner that for the first coating which is applied directly to the article itself a celluloid-rosin solution is employed in which the percentage contents of the rosin is higher than the contents of celluloid, whereupon in the subsequent coatings the contents of rosin becomes graduallyless, until finally a coating of pure cell-uloid is applied to the surface, if desired.

coats the individual coats diffuse into one another so that they equalize one another in regard to internal stresses. The polish may then be rubbed smooth with p'umicestone and can then be finished with a-p ad moistened with methylated spirit.

Emample.

Thefirst coat consists, for instance, of a v varnish which'contains 5% of celluloid and 10% of rosin dissolved in the known solvent. After a short drying period a second coat is applied with a rosin contents of about 5% and a celluloid contents of also 5% and later on a third coat of pure celluloid.

What we claim as our invention is:

1. The method of polishing Woodwork by means of celluloid-rosin solutions, which consists in applying to the surface of the article to be polished a celluloid-rosin solution in which the contents of rosin considerably exceeds the contents of celluloid, whereupon on the dry first coat one or more coats are applied in which the celluloid contents is equal to or higher than the rosin contents, so that the rosin contents in the following coats become gradually less and the last and finishing coat may consist of a pure celluloid solution. 

